Marijuana before I knew

So before I found out I was pregnant I was a pretty regular marijuana smoker (haven’t touched it since I found out on New Year’s <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> ) I’m just wondering if I should tell my doctor this . On one hand since I’ve stopped I don’t think it should matter but part of me is scared of if they happen to test for it and find some trace amounts that haven’t yet left my system they’ll want to involve cps when my child is born